@devnull: "I'm getting the following error in the application log on my Exchange 2003 
server, it's happening quite a few times a day.
The email address of the To: is different every time
Source:         MSExchangeIS Public Store
Category:      Transport Delivering
Event ID:      2028
The delivery of a message sent by public folder 
ALERTS2C1AB9E22C1AB9E22C1AB9E2F1AD74A501EC24 has failed.
 To: <email_address>
 Cc:
 The non-delivery report has been deleted.
Thanks"
    @mattrich: "259343 XADM: Events 2028 and 290 from Messages Sent by a Public Folder
<url>
Matt Richoux
Exchange Support
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"Peter Lawton" <email_address> wrote in message 
news:<email_address>
<quote>"
{'source': 'USENET', 'other_information': '{"reply_count": 1, "forum_name": "microsoft.public.exchange2000.general.20140608.mbox"}', 'file': 'data/output/usenet-microsoft.public.parquet'}